The Blue River comes up cold and clear out of the rock in this corner of Johnston County, and the pecan bottoms along it stay green long after the uplands have gone tan. Greenworx Lawncare & Landscaping LLC works the west side of the county — mowing, edging, string trimming and seasonal cleanup — from town lots to long drives running out toward the Arbuckle foothills. Limestone country grows heavy bermuda where there is water and thin grass where there is not, so no two yards get the same pass. A clean edge along a gravel drive out here is a genuine pleasure to look back at from the truck. Fall cleanups run late, because the pecans hold their leaves the way they hold their nuts — stubbornly.